X-Git-Url: https://wimlib.net/git/?a=blobdiff_plain;ds=sidebyside;f=src%2Flookup_table.h;h=6facf65adf7052ee6c282d7c719fcdc25d6189e6;hb=5aff98df1f754cd809b88051caad99c58b50dfab;hp=6deb86fc531f7a74842b6adf6c1ca4e3a03c6798;hpb=6f7956a06fcf92a304fae93e393e8eaee34e92d5;p=wimlib diff --git a/src/lookup_table.h b/src/lookup_table.h index 6deb86fc..6facf65a 100644 --- a/src/lookup_table.h +++ b/src/lookup_table.h @@ -2,27 +2,40 @@ #define _WIMLIB_LOOKUP_TABLE_H #include "wimlib_internal.h" #include "dentry.h" +#include "sha1.h" #include /* Size of each lookup table entry in the WIM file. */ #define WIM_LOOKUP_TABLE_ENTRY_DISK_SIZE 50 +#define LOOKUP_FLAG_ADS_OK 0x00000001 +#define LOOKUP_FLAG_DIRECTORY_OK 0x00000002 +#define LOOKUP_FLAG_FOLLOW_SYMLINKS 0x00000004 + /* A lookup table that is used to translate the hash codes of dentries into the * offsets and sizes of uncompressed or compressed file resources. It is * implemented as a hash table. */ struct lookup_table { - struct lookup_table_entry **array; + struct hlist_head *array; u64 num_entries; u64 capacity; }; -/* An entry in the lookup table in the WIM file. */ +struct wimlib_fd; + +/* + * An entry in the lookup table in the WIM file. + * + * It is used to find data streams for files in the WIM. + * + * The lookup_table_entry for a given dentry in the WIM is found using the SHA1 + * message digest field. + */ struct lookup_table_entry { - /* The next struct lookup_table_entry in the hash bucket. NULL if this is the - * last one. */ - struct lookup_table_entry *next; + /* List of lookup table entries in this hash bucket */ + struct hlist_node hash_list; /* @resource_entry is read from the lookup table in the WIM * file; it says where to find the file resource in the WIM @@ -32,13 +45,18 @@ struct lookup_table_entry { /* Currently ignored; set to 1 in new lookup table entries. */ u16 part_number; + /* If %true, this lookup table entry corresponds to a symbolic link + * reparse buffer. @symlink_reparse_data_buf will give the target of + * the symbolic link. */ + bool is_symlink; + /* Number of times this lookup table entry is referenced by dentries. */ u32 refcnt; union { /* SHA1 hash of the file resource pointed to by this lookup * table entry */ - u8 hash[WIM_HASH_SIZE]; + u8 hash[SHA1_HASH_SIZE]; /* First 4 or 8 bytes of the SHA1 hash, used for inserting the * entry into the hash table. Since the SHA1 hashes can be @@ -56,6 +74,7 @@ struct lookup_table_entry { union { char *file_on_disk; char *staging_file_name; + void *symlink_buf; struct lookup_table_entry *next_lte_in_swm; }; @@ -71,21 +90,12 @@ struct lookup_table_entry { int other_wim_ctype; }; - struct { /* Used for read-write mounts. */ - + struct { /* Used for wimlib_mount */ - /* Offset of the stream file_on_disk_fd. */ - off_t staging_offset; - - - /* If file_on_disk_fd, if it is not -1, is the file - * descriptor, opened for reading, for file_on_disk. */ - int staging_fd; - - /* Number of times the file has been opened. - * file_on_disk_fd can be closed when num_times_opened - * is decremented to 0. */ - int staging_num_times_opened; + /* File descriptors table for this data stream */ + struct wimlib_fd **fds; + u16 num_allocated_fds; + u16 num_opened_fds; }; }; @@ -99,23 +109,43 @@ struct lookup_table_entry { * * output_resource_entry is the struct resource_entry for the position of the * file resource when written to the output file. */ - union { - u32 out_refcnt; - bool refcnt_is_incremented; - }; + u32 out_refcnt; struct resource_entry output_resource_entry; + + /* Circular linked list of streams that share the same lookup table + * entry + * + * This list of streams may include streams from different hard link + * sets that happen to be the same. */ + struct list_head lte_group_list; + + /* List of lookup table entries that correspond to streams that have + * been extracted to the staging directory when modifying a read-write + * mounted WIM. */ + struct list_head staging_list; }; + extern struct lookup_table *new_lookup_table(size_t capacity); extern void lookup_table_insert(struct lookup_table *table, struct lookup_table_entry *lte); -extern void lookup_table_unlink(struct lookup_table *table, - struct lookup_table_entry *lte); +/* Unlinks a lookup table entry from the table; does not free it. */ +static inline void lookup_table_unlink(struct lookup_table *table, + struct lookup_table_entry *lte) +{ + hlist_del(<e->hash_list); + table->num_entries--; +} + -extern void lookup_table_decrement_refcnt(struct lookup_table* table, - const u8 hash[]); +extern struct lookup_table_entry * +lookup_table_decrement_refcnt(struct lookup_table* table, const u8 hash[]); + +extern struct lookup_table_entry * +lte_decrement_refcnt(struct lookup_table_entry *lte, + struct lookup_table *table); extern struct lookup_table_entry *new_lookup_table_entry(); @@ -124,18 +154,17 @@ extern int for_lookup_table_entry(struct lookup_table *table, int (*visitor)(struct lookup_table_entry *, void *), void *arg); -extern struct lookup_table_entry *lookup_resource(const struct lookup_table *table, - const u8 hash[]); +extern struct lookup_table_entry * +__lookup_resource(const struct lookup_table *table, const u8 hash[]); -static inline struct lookup_table_entry * -wim_lookup_resource(const WIMStruct *w, const struct dentry *dentry) -{ - return lookup_resource(w->lookup_table, dentry->hash); -} +extern int lookup_resource(WIMStruct *w, const char *path, + int lookup_flags, struct dentry **dentry_ret, + struct lookup_table_entry **lte_ret, + unsigned *stream_idx_ret); extern int zero_out_refcnts(struct lookup_table_entry *entry, void *ignore); -extern int print_lookup_table_entry(struct lookup_table_entry *entry, void *ignore); +extern void print_lookup_table_entry(struct lookup_table_entry *entry); extern int read_lookup_table(FILE *fp, u64 offset, u64 size, struct lookup_table **table_ret); @@ -144,13 +173,9 @@ extern void free_lookup_table(struct lookup_table *table); extern int write_lookup_table_entry(struct lookup_table_entry *lte, void *__out); -static inline void free_lookup_table_entry(struct lookup_table_entry *lte) -{ - if (lte) { - FREE(lte->file_on_disk); - FREE(lte); - } -} +extern void free_lookup_table_entry(struct lookup_table_entry *lte); + +extern int dentry_resolve_ltes(struct dentry *dentry, void *__table); /* Writes the lookup table to the output file. */ static inline int write_lookup_table(struct lookup_table *table, FILE *out) @@ -172,4 +197,118 @@ static inline struct resource_entry* wim_metadata_resource_entry(WIMStruct *w) w->current_image - 1].metadata_lte->resource_entry; } +static inline struct lookup_table_entry * +dentry_stream_lte_resolved(const struct dentry *dentry, unsigned stream_idx) +{ + wimlib_assert(dentry->resolved); + wimlib_assert(stream_idx <= dentry->num_ads); + if (stream_idx == 0) + return dentry->lte; + else + return dentry->ads_entries[stream_idx - 1].lte; +} + +static inline struct lookup_table_entry * +dentry_stream_lte_unresolved(const struct dentry *dentry, unsigned stream_idx, + const struct lookup_table *table) +{ + wimlib_assert(!dentry->resolved); + wimlib_assert(stream_idx <= dentry->num_ads); + if (!table) + return NULL; + if (stream_idx == 0) + return __lookup_resource(table, dentry->hash); + else + return __lookup_resource(table, + dentry->ads_entries[ + stream_idx - 1].hash); +} +/* + * Returns the lookup table entry for stream @stream_idx of the dentry, where + * stream_idx = 0 means the default un-named file stream, and stream_idx >= 1 + * corresponds to an alternate data stream. + * + * This works for both resolved and un-resolved dentries. + */ +static inline struct lookup_table_entry * +dentry_stream_lte(const struct dentry *dentry, unsigned stream_idx, + const struct lookup_table *table) +{ + if (dentry->resolved) + return dentry_stream_lte_resolved(dentry, stream_idx); + else + return dentry_stream_lte_unresolved(dentry, stream_idx, table); +} + + +static inline const u8 *dentry_stream_hash_unresolved(const struct dentry *dentry, + unsigned stream_idx) +{ + wimlib_assert(!dentry->resolved); + wimlib_assert(stream_idx <= dentry->num_ads); + if (stream_idx == 0) + return dentry->hash; + else + return dentry->ads_entries[stream_idx - 1].hash; +} + +static inline const u8 *dentry_stream_hash_resolved(const struct dentry *dentry, + unsigned stream_idx) +{ + struct lookup_table_entry *lte; + lte = dentry_stream_lte_resolved(dentry, stream_idx); + if (lte) + return lte->hash; + else + return NULL; +} + +/* + * Returns the hash for stream @stream_idx of the dentry, where stream_idx = 0 + * means the default un-named file stream, and stream_idx >= 1 corresponds to an + * alternate data stream. + * + * This works for both resolved and un-resolved dentries. + */ +static inline const u8 *dentry_stream_hash(const struct dentry *dentry, + unsigned stream_idx) +{ + if (dentry->resolved) + return dentry_stream_hash_resolved(dentry, stream_idx); + else + return dentry_stream_hash_unresolved(dentry, stream_idx); +} + +static inline struct lookup_table_entry * +dentry_first_lte_resolved(const struct dentry *dentry) +{ + struct lookup_table_entry *lte; + wimlib_assert(dentry->resolved); + + for (unsigned i = 0; i <= dentry->num_ads; i++) { + lte = dentry_stream_lte_resolved(dentry, i); + if (lte) + return lte; + } + return NULL; +} + +static inline struct lookup_table_entry * +dentry_first_lte_unresolved(const struct dentry *dentry, + const struct lookup_table *table) +{ + struct lookup_table_entry *lte; + wimlib_assert(!dentry->resolved); + + for (unsigned i = 0; i <= dentry->num_ads; i++) { + lte = dentry_stream_lte_unresolved(dentry, i, table); + if (lte) + return lte; + } + return NULL; +} + +extern struct lookup_table_entry * +dentry_first_lte(const struct dentry *dentry, const struct lookup_table *table); + #endif